imagedataobject.h

模拟popo的一个程序

// ImageDataObject.h: Impementation for IDataObject Interface to be used 
//					     in inserting bitmap to the RichEdit Control.
//
// Author : Hani Atassi  ([e-mail])
//
// How to use : Just call the static member InsertBitmap with 
//				the appropriate parrameters. 
//
// Known bugs :
//
//
//////////////////////////////////////////////////////////////////////

#if !defined(AFX_IMAGEDATAOBJECT_H__7E162227_62B8_49E3_A35B_FEC3F241A78F__INCLUDED_)
#define AFX_IMAGEDATAOBJECT_H__7E162227_62B8_49E3_A35B_FEC3F241A78F__INCLUDED_

#if _MSC_VER > 1000
#pragma once
#endif // _MSC_VER > 1000

class CImageDataObject : IDataObject
{
public:
	// This static fumction accepts those parameters:
	// IRichEditOle* : a pointer to IRochEditOle interface for the RichEdit Control
	// HBITMAP : the bitmap handle.
	//
	// After calling the function, it inserts the image in the current 
	//    position of the RichEdit
	//
	static void InsertBitmap(IRichEditOle* pRichEditOle, HBITMAP hBitmap, DWORD dwData = 0);

private:
	ULONG	m_ulRefCnt;
	BOOL	m_bRelease;

	// The data being bassed to the richedit
	//
	STGMEDIUM m_stgmed;
	FORMATETC m_fromat;

public:
	CImageDataObject() : m_ulRefCnt(0)
	{
		m_bRelease = FALSE;
	}

	~CImageDataObject()
	{
		if (m_bRelease)
			::ReleaseStgMedium(&m_stgmed);
	}

	// Methods of the IUnknown interface
	// 
	STDMETHOD(QueryInterface)(REFIID iid, void ** ppvObject)
	{
		if (iid == IID_IUnknown || iid == IID_IDataObject)
		{
			*ppvObject = this;
			AddRef();
			return S_OK;
		}
		else
			return E_NOINTERFACE;
	}
	STDMETHOD_(ULONG, AddRef)(void)
	{
		m_ulRefCnt++;
		return m_ulRefCnt;
	}
	STDMETHOD_(ULONG, Release)(void)
	{
		if (--m_ulRefCnt == 0)
		{
			delete this;
		}

		return m_ulRefCnt;
	}

	// Methods of the IDataObject Interface
	//
	STDMETHOD(GetData)(FORMATETC *pformatetcIn, STGMEDIUM *pmedium) {
		HANDLE hDst;
		hDst = ::OleDuplicateData(m_stgmed.hBitmap, CF_BITMAP, NULL);
		if (hDst == NULL)
		{
			return E_HANDLE;
		}

		pmedium->tymed = TYMED_GDI;
		pmedium->hBitmap = (HBITMAP)hDst;
		pmedium->pUnkForRelease = NULL;

		return S_OK;
	}
	STDMETHOD(GetDataHere)(FORMATETC* pformatetc, STGMEDIUM*  pmedium ) {
		return E_NOTIMPL;
	}
	STDMETHOD(QueryGetData)(FORMATETC*  pformatetc ) {
		return E_NOTIMPL;
	}
	STDMETHOD(GetCanonicalFormatEtc)(FORMATETC*  pformatectIn ,FORMATETC* pformatetcOut ) 	{
		return E_NOTIMPL;
	}
	STDMETHOD(SetData)(FORMATETC* pformatetc , STGMEDIUM*  pmedium , BOOL  fRelease ) {
		m_fromat = *pformatetc;
		m_stgmed = *pmedium;

		return S_OK;
	}
	STDMETHOD(EnumFormatEtc)(DWORD  dwDirection , IEnumFORMATETC**  ppenumFormatEtc ) {
		return E_NOTIMPL;
	}
	STDMETHOD(DAdvise)(FORMATETC *pformatetc, DWORD advf, IAdviseSink *pAdvSink,
		DWORD *pdwConnection) {
		return E_NOTIMPL;
	}
	STDMETHOD(DUnadvise)(DWORD dwConnection) {
		return E_NOTIMPL;
	}
	STDMETHOD(EnumDAdvise)(IEnumSTATDATA **ppenumAdvise) {
		return E_NOTIMPL;
	}

	// Some Other helper functions
	//
	void SetBitmap(HBITMAP hBitmap);
	IOleObject *GetOleObject(IOleClientSite *pOleClientSite, IStorage *pStorage);

};

#endif // !defined(AFX_IMAGEDATAOBJECT_H__7E162227_62B8_49E3_A35B_FEC3F241A78F__INCLUDED_)